Drill: Determine if the following are molecular or empirical: C3H8N

Objective: The student will be able to: Explore Arithmetic equations in order to explain how balanced equations apply to both chemistry and everyday situations.

SAT/HSA Enrichment Chloral hydrate is a sedative that has played a part in the deaths of a number of celebrities. It has the composition: 14.52% C, 1.828 % H, 64.30% Cl, and 19.35% O. The empirical formula of Chloral hydrate is… CHClO C2H2ClO CHCl2O C2H3Cl3O2 C3H3Cl2O3

How do I express a chemical equation? Stoichiometry How do I express a chemical equation?

Inquiry Activity 15 min How Many Can You Make? Purpose: Use simple molecular models to demonstrate the concept of a limiting reagent in a chemical reaction. 15 min

Quantitative Analysis Lab Purpose: To determine the values for the coefficients used in a balanced chemical equation. Complete the Procedure for Day 1 (1-4) Come back to your seats! 10 Min

Using Everyday Equations More than 3000 cocoons are needed to produce enough silk to make just one elegant Japanese kimono. Like silk manufacturers, chemists must know how much reactant they need to make a certain amount of product. Determining the quantities of reactants and products in a reaction requires a balanced chemical equation.

Using Everyday Equations A balanced chemical equation provides the same kind of quantitative information that a recipe does.

Using Everyday Equations An equation can represent the manufacturing of a single tricycle.

Using Balanced Chemical Equations Chemists use balanced chemical equations as a basis to calculate how much reactant is needed or product is formed in a reaction. The calculation of quantities in chemical reactions is a subject of chemistry called Stoichiometry.

Sample Problem

Sample Problem

Sample Problem

Sample Problem

Practice Problem 2

Interpreting Chemical Equations A balanced chemical equation can be interpreted in terms of different quantities, including numbers of atoms, molecules, or moles; mass; and volume.

Interpreting Chemical Equations Number of Atoms

Interpreting Chemical Equations Number of Molecules

Interpreting Chemical Equations Moles

Interpreting Chemical Equations Mass

Interpreting Chemical Equations Volume

Interpreting Chemical Equations

Mass Conservation in Chemical Reactions Mass and atoms are conserved in every chemical reaction.

Quantitative Analysis Complete procedure Day 1 (5-9) Clean up Return to your seats! 20 min

Summary Did we accomplish the objective? Explain. How is a balanced equation similar to a recipe? How do chemists use balanced equations? Chemical reactions can be described in terms of quantities? What quantities are always conserved in chemical reactions?

Exit Ticket Arithmetic Equations Exit ticket Homework: Arithmetic Equations worksheet.